Dental crown-forming tool.



R. R. BRASWELL.

DENTAL CROWN FORMING TOOL.

APPLICATION FILED 10110.14, 1909.

978,430. Patented Dec. 13,1910

UNITED STATES PATENT OFFICE.

RICHARD R. BRASWELL, OF SHREVEPORT, LOUISIANA, ASSIGNOR OF ONE-HALF 'IOJULIA J. NELSON, OF SI-IREVEPOR'I, LOUISIANA.

DENTAL CROWN-FORMING TOOL.

To all whom it may concern:

Be it known that I, Brennan R. BRAS- WELL, a citizen of the UnitedStates, residing at Shreveport, in the parish of Caddo and State ofLouisiana, have invented a new and useful Dental Crown-Forming Tool, ofwhich the following is a specification.

This invention relates to dental tools in the form of pliers designedfor making crowns, and the invention has for its principal object toprovide a pair of pliers having jaws so designed as to shape the bandfor the crown, and adapted to receive removable forms whereby the finalshape can be given to the crown.

WVith these objects in view and others, as will appear as thedescription proceeds, the invention comprises the various novel featuresof construction and arrangement of parts which will be more fullydescribed hereinafter and set forth with particularity in the claimsappended hereto.

In the accompanying drawing, which illustrates one embodiment of theinvention, Figure 1 is a perspective view of the crown forminginstrument. Fig. 2 is a fragmentary plan view thereof. Fig. 3 is atransverse section on line 3-3, Fig. 2, showing the process of formingthe crown band. Fig. 4 is a perspective view of one of the formsremoved. Fig. 5 is a perspective view of one of the plier jaws. Fig. 6is a sectional view showing the forming of the crown. Fig. 7 is aperspective view of the crown.

Similar reference characters are employed to designate correspondingparts throughout the views.

Referring to the drawing, A designates the tool which is in the natureof pliers haviug'handles l and 2 pivotally connected at 3 and formedwith jaws t and 5. The opposed faces 6 and 7 of the jaws are,respectively, concave and convex in order to curve the metal strip 8 ofwhich the crown is made, as shown in Fig. 3. The ends of the strip canbe brought together as shown by the dotted lines and soldered togetherwhile held between the jaws. On the extremities of the jaws are forms 9and 10 for shaping the crown to its final form, there being as many setsof forms as there are teeth. These forms may be made of steel or anyother suitable metal and each Specification of Letters Patent.

Application filed December 14, 1909.

Patented Dec. 13, 1910. Serial No. 533,003.

is provided with a stem shank 11 which tapers outwardly from the body ofthe form, and these stems fit in recesses 12 in the outer surfaces ofthe jaws. The recesses extend longitudinally of the jaws and are in theform of dovetail grooves, as clearly shown in Figs. 3 and 5, and thestems 11 are of dovetail cross section so as to interlock with theundercut opposed walls of the grooves. By this arrangement. the formscan be conveniently attached or detached without the use of fastenings,the forms being held in place by the wedging action of the stems intheir respective grooves.

In producing a crown by the use of my improved tool, the appropriateforms for the desired crown are fitted to the plier jaws and a strip 8of the required length is then clasped by the opposed engaging concaveand convex jaws t3 and 7 of the pliers and is drawn between the same sothat it will be given an approximately circular shape, as will bereadily understood 0n reference to Fig. 3. The ends of the band thusshaped are soldered together, and the band is then engaged between theforms 9 and 10 and pressure applied to the said forms through thehandles of the tool so that the form will be shaped, as indicated inFig. 6. side of the band has thus been given the desired shape, theopposite side is treated in the same manner so that the crown will beeasily and quickly made.

My invention avoids the necessity of keeping in stock a large number ofcrowns, inasmuch as the forms or dies by which the crowns are formed areremovable and a single pair of pliers may be used with any number ofdifferent forms. Furthermore, the dies necessary to produce a crowncorresponding exactly to the shape of the patients tooth may be readilyfitted to the pliers so that no delay will be experienced in forming thecrown.

From. the foregoing description, taken in connection with theaccompanying drawing, the advantages of the construction and of themethod of operation will be readily apparent to those skilled in the artto which the invention appertains, and while I have described theprlnciple of operation of the invention, together with the device whichI now consider to be the best embodiment thereof, I desire to have itunderstood that the device shown is merely illustrative, and

After one that such changes may be made when desired as are within thescope of the claims appended hereto.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A dental tool comprising jaw members pivotally connected and havingconcave and convex band forming faces respectively and also havinglongitudinally -extending grooves, and crown-shaping forms provided withsteam fitting in the grooves and the working faces of the forms beingflush with the said band-forming faces of the jaws.

2. A dental tool comprising aw members having their opposed facesconcave and con vex respectively and formed with longitudinallyextending dovetail grooves in their outer faces, crown-shaping forms atthe extremities of the jaws, and attaching stems on the forms fitting inthe grooves for detachably securing the forms in place.

3. A dental tool comprising hingedly-connected handles each having a jawmember, the outer faces of the aw members havinglongitudinally-extending dovetail grooves tapering inwardly,crown-shaping forms dis posed at the extremities of the jaw member, andwedge-shaped stems on the forms of dovetail cross section for wedging inthe grooves of the jaw members.

In testimony, that I claim the foregoing as my own, I have heretoaflixed my signaturein the presence of tWo witnesses.

RICHARD R. BRASWELL. Witnesses A. B. NELSON, R. A. SLATTERY.

